Title:
ZOOM LENS, IMAGING DEVICE, AND ZOOM LENS PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2015/146175
Kind Code:
A1
Abstract:
The present invention includes, in order from the object side, a first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a negative refractive power, and a fourth lens group (G4) having a positive refractive power. The air gap between the first lens group (G1) and the second lens group (G2) is varied to vary magnification, and conditional formula (1) (０．６０＜ｆ４／ｆｗ＜１．１5), in which f4 is the focal distance of the fourth lens group (G4) and fw is the focal distance of the entire system in a wide angle end state during infinity focusing, is satisfied.
Inventors:
SATO HARUO (JP)
MATSUO TAKU (JP)
MATSUO TAKU (JP)
Application Number:
PCT/JP2015/001717
Publication Date:
October 01, 2015
Filing Date:
March 26, 2015
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Foreign References:
| JPS63278013A | 1988-11-15 | |||
| JP2005141056A | 2005-06-02 | |||
| JPH0727978A | 1995-01-31 | |||
| JP2009251118A | 2009-10-29 | |||
| JPS59219711A | 1984-12-11 |
Other References:
See also references of EP 3125010A4
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Shogo Onishi (JP)
Shogo Onishi (JP)
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